I agree with Mr. Clark, as a proud owner of a Titanium colored Curve, I wish I had gone with a Crimson. Gold would have been top choice, but I wouldn't switch carriers for color. So many new models each year, who knows what phone/color will be available on a carrier in 6 months.

Would the Curve be a different phone completely than your current BB?
If you already have a Curve through ATT maybe you could just replace the external casing. I have the Ti Curve and just use a skin to modify the color depending on my mood.